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If x is equal to the sum of even integers from 40 to 60, inclusive, and y is the number of even integers from 40 to 60, inclusive, what is the value of y?

(A) 550(B) 551(C) 560(D) 561(E) 572

Please explain your answer.

I agree with ranga41... is there something missing in this question or a typo?

If its sum... lazy_k is on the money with the solution!

we are asked to find the "number of even integers" or y between 40 and 60 which would be 11... ??

It is a typo. It suppose to be "what is the value of x + y?" Sorry.

This is an AP with the first tem as 40 and last term as 60 and there are 11 terms between 40 and 60 with a difference of 2, so sum of these terms is
s = (n/2) (a + l) = (11/2) (40 + 60) = 550 = X
Y = number of terms = 11
so the answer is 561

Re: If x is equal to the sum of even integers from 40 to 60, [#permalink]

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12 Nov 2017, 04:31

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